19972550 has 24 divisors (see below), whose sum is σ = 40007856. Its totient is φ = 7374240.

The previous prime is 19972541. The next prime is 19972567. The reversal of 19972550 is 5527991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14714 + ... + 16013.

It is an arithmetic number, because the mean of its divisors is an integer number (1666994).

Almost surely, 2^19972550 is an apocalyptic number.

19972550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19972550 is an abundant number, since it is smaller than the sum of its proper divisors (20035306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19972550 is a wasteful number, since it uses less digits than its factorization.

19972550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30752 (or 30747 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 19972550 is about 4469.0658979254. The cubic root of 19972550 is about 271.3175201957.

The spelling of 19972550 in words is "nineteen million, nine hundred seventy-two thousand, five hundred fifty".